<html>

<head>
    <meta charset="utf-8">
    <title></title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
    <link rel="stylesheet" href="./style.css">
</head>

<body>

    <h4>来源： https://codepen.io/v_Bauer/pen/WNroMOq</h4>

    <div id="navbarContainer">
        <div id="navbar">
            <div id="bubbleWrapper">
                <div id="bubble1" class="bubble"><span class="icon"><i class="fa fa-home"></i></span></div>
                <div id="bubble2" class="bubble"><span class="icon"><i class="fa fa-twitter"></i></span></div>
                <div id="bubble3" class="bubble"><span class="icon"><i class="fa fa-bell"></i></span></div>
                <div id="bubble4" class="bubble"><span class="icon"><i class="fa fa-user"></i></span></div>
            </div>
            <div id="menuWrapper">
                <div id="menu1" class="menuElement" onclick="move('1', '50px', '#ffcc80')"><i class="fa fa-home"></i>
                </div>
                <div id="menu2" class="menuElement" onclick="move('2', '150px', '#81d4fa')"><i
                        class="fa fa-twitter"></i></div>
                <div id="menu3" class="menuElement" onclick="move('3', '250px', '#c5e1a5')"><i class="fa fa-bell"></i>
                </div>
                <div id="menu4" class="menuElement" onclick="move('4', '350px', '#ce93d8')"><i class="fa fa-user"></i>
                </div>
            </div>
        </div>
        <div id="bgWrapper">
            <div id="bg"></div>
            <div id="bgBubble"></div>
        </div>
    </div>

    <svg width="0" height="0">
        <defs>
            <filter id="goo">
                <feGaussianBlur in="SourceGraphic" stdDeviation="20" result="blur" id="blurFilter" />
                <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 30 -15"
                    result="goo" />
                <feComposite in="SourceGraphic" in2="goo" operator="atop" />
            </filter>
        </defs>
    </svg>



    <script src='gsap.min.js'></script>
    <script>
        function move(id, position, color) {
            var tl = gsap.timeline();
            tl.to("#bgBubble", { duration: 0.15, bottom: "-30px", ease: "ease-out" }, 0)
                .to("#bubble1", { duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out", }, 0)
                .to("#bubble2", { duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out", }, 0)
                .to("#bubble3", { duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out", }, 0)
                .to("#bubble4", { duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out", }, 0)
                .to(".icon", { duration: 0.05, opacity: 0, ease: "ease-out", }, 0)
                .to("#bgBubble", { duration: 0.2, left: position, ease: "ease-in-out" }, 0.1)
                .to("#bgBubble", { duration: 0.15, bottom: "-50px", ease: "ease-out" }, '-=0.2')
                .to(`#bubble${id}`, { duration: 0.15, y: "0%", opacity: 1, boxShadow: '0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24)', ease: "ease-out" }, '-=0.1')
                .to(`#bubble${id}> span`, { duration: 0.15, y: "0%", opacity: 0.7, ease: "ease-out" }, '-=0.1')
                .to("#navbarContainer", { duration: 0.3, backgroundColor: color, ease: "ease-in-out" }, 0)
                .to("#bg", { duration: 0.3, backgroundColor: color, ease: "ease-in-out" }, 0)
                .to("#bgBubble", { duration: 0.3, backgroundColor: color, ease: "ease-in-out" }, 0)
        }
    </script>
</body>

</html>